the thread below reminded me,

where would i get grease caps for my bedford midi uprights? do they normally come with bearing kits?

Not usualy in bearing kits. Probably only available from GM dealer and most likely not a stock item any more so you'll have to order them..

Companies such as Towsure and Indespension do them for trailer hubs but not sure if they'll fit yours.
Maybe best to buy one - Towsure cheapest @ £0.75.
Cheers, Pewe